Unlock instant, AI-driven research and patent intelligence for your innovation.

Liquid ejecting head and ink jet printing apparatus

a liquid ejecting head and ink jet printing technology, applied in printing and other directions, can solve the problems of inappropriate printing, scraping or damage of protective film, and preventing the desired liquid ejection performance and ejection efficiency from being achieved, so as to reduce the possibility of mist, the effect of high accuracy and more durabl

Inactive Publication Date: 2011-10-25
CANON KK
View PDF13 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0015]The present invention provides a liquid ejecting head which is more durable due to an energy acting chamber in which a liquid is bubbled and which has an asymmetric shape, the liquid ejecting head provides highly accurate ink ejection to be maintained while enabling a reduction in possible mist. The present invention also provides an ink jet printing apparatus using the above-described liquid ejecting head.
[0018]According to the present invention, even when the position of the energy acting chamber in which the liquid is bubbled is displaced from the position of the heating element in order to make the liquid ejecting head more durable, the second ejecting portion displaced from the energy acting chamber in the opposite direction allows a trailing portion of the droplet to return to the center of the ejection port portion. That is, the trailing portion of the ejected droplet is not subjected to a force biased toward one direction but is ejected straight in the ejecting direction. Thus, the accuracy with which the droplet is ejected can be kept high. Furthermore, since the trailing portion of the ejected droplet is not subjected to the force biased toward one direction, possible mist can be reduced when the droplet is ejected.
[0019]Additionally, when the ink droplets as liquid droplets are ejected from the liquid ejecting head as a print head to print an image on the print medium, the impact accuracy of each ink droplet on the print medium can be improved to achieve a high quality print image. Moreover, possible ink mists can be reduced.

Problems solved by technology

This may prevent desired liquid ejection performance and ejection efficiency from being achieved.
Furthermore, a possible impact force caused by cavitation during a debubbling process may scrape or damage the protective film.
The degraded function of the protective film may cause the ink to be in appropriately ejected or result in inappropriate printing.
The satellites may impact the print medium at an inaccurate position (impacting accuracy) or become small floating mists.
If the mist adheres to a peripheral part of the ejection port in the print head, the mist may hinder movement of the ejected ink and reduce the accuracy of the ink droplet impact.
The reduced impact accuracy of the ink droplets may cause ink dots to be formed at unexpected positions on the print medium.
This may degrade the quality of a printed image.
Furthermore, if the ink mist adheres to the print head and an unspecified part in the printing apparatus, the printing apparatus may malfunction.
Additionally, the ink adhering to the printing apparatus may stain the print medium to degrade the print quality of the printed medium.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Liquid ejecting head and ink jet printing apparatus
  • Liquid ejecting head and ink jet printing apparatus
  • Liquid ejecting head and ink jet printing apparatus

Examples

Experimental program
Comparison scheme
Effect test

first embodiment

[0034]A first embodiment for carrying out the present invention will be described below with reference to the attached drawings.

[0035]FIG. 1 is a perspective view of an ink jet printing apparatus 101 that uses a print head as a liquid ejecting head according to the first embodiment of the present invention. The ink jet printing apparatus 101 in the present example is of a serial scan type. Print heads and ink tanks corresponding to a plurality of ink colors are removably mounted on a carriage 102 that is moved in the direction of arrow X by a movement mechanism. In the present example, the print head and the ink tank constitutes an ink jet cartridge 103. A print medium S is conveyed, by a conveyor mechanism, in the direction of arrow Y crossing (in the present example, orthogonal to) the direction of arrow X through a print position located opposite the print head 1.

[0036]A print scan by the print head and an operation of conveying the print medium S in the direction of arrow Y are ...

second embodiment

[0069]A print head according to a second embodiment of the present invention will be described with reference to FIGS. 8 to 11. Components of the second embodiment which are similar to those of the first embodiment are denoted by the same reference numerals and will not be described below.

[0070]FIG. 8 is a sectional view of one of the nozzles 5 in the print head according to the second embodiment as viewed in the ejection direction D3. FIG. 9 is a sectional view of the nozzle 5 taken along line IX-IX in FIG. 8. FIG. 10 is a sectional view of the nozzle 5 taken along line X-X in FIG. 8.

[0071]In the print head according to the present embodiment, as is the case with the print head 1 according to the first embodiment, the volume VA of the area A is set to be larger than the volume VB of the area B, and the volume VA′ of the area A′ is set to be smaller than the volume VB′ of the area B′. In addition, in the present embodiment, a virtual plane passing through the center O1 of the ink ch...

third embodiment

[0074]A third embodiment of the present invention will be described with reference to FIG. 12. Components of the third embodiment which are similar to those of the first embodiment are denoted by the same reference numerals and will not be described below.

[0075]FIG. 12 is a sectional view of an essential part of nozzle arrays in a print head according to the third embodiment as viewed in the ejection direction D3. The print head according to the present embodiment includes long nozzles 5a each having a long ink channel 8 formed therein and short nozzles 5b each having a short ink channel 8 formed therein; the long and short nozzles 5a and 5b are alternately arranged. The interval between the long nozzles 5a is set equal to a pitch corresponding to 600 dpi. The interval between the short nozzles 5b is also set equal to a pitch corresponding to 600 dpi. The interval between the long nozzle 5a and short nozzle 5b which are adjacent to each other is set equal to a pitch corresponding to...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

When each of an energy acting chamber and a second ejection port portion is partitioned by a first virtual plane into an area positioned on a first side of the first virtual plane and an area positioned on a second side of the first virtual plane, the energy acting chamber has a larger volume in the first side area than in the second side area. Conversely, the second ejection port portion has a smaller volume in the first side area than in the second side area. The first virtual plane is parallel to both a supply direction of a liquid flowing to the energy acting chamber and an ejection direction, and passes through a center of a heating element. The first virtual plane divides each of the energy acting chamber and the second ejection port portion into two parts in an orthogonal direction orthogonal to the supply direction.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a liquid ejecting head that accurately ejects ink droplets, and an ink jet printing apparatus.[0003]2. Description of the Related Art[0004]In recent years, serial scan type ink jet printing apparatuses (liquid ejecting apparatuses) have been increasing rapidly, in which a print head, as a liquid ejecting head, ejects ink droplets (liquid droplets) during movement with respect to a print medium to print on the print medium. These ink jet printing apparatuses have the advantages of being easily miniaturized and capable of printing color images relatively easily. In addition to the serial scan type ink jet printing apparatus, which prints images by moving the print head, full line type ink jet printing apparatuses are available. This type of printing apparatus uses a long print head extending all along a print area of the print medium in a width direction to print images without the need to...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(United States)
IPC IPC(8): B41J2/175
CPCB41J2/1404B41J2/14056B41J2002/14403B41J2002/14475
Inventor MATSUMOTO, MITSUHIRO
Owner CANON KK